diff --git a/src/Adapter/Doctrine/ORMAdapter.php b/src/Adapter/Doctrine/ORMAdapter.php
index 0d8f4ab..b661f3a 100644
--- a/src/Adapter/Doctrine/ORMAdapter.php
+++ b/src/Adapter/Doctrine/ORMAdapter.php
@@ -31,6 +31,9 @@
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
+// Help opcache.preload discover always-needed symbols
+interface_exists(QueryBuilderProcessorInterface::class);
+
 /**
  * ORMAdapter.
  *